Regularize ownerships and lifecycle for storage monitor platform classes.

chrome/browser/storage_monitor/removable_device_notifications_mac.mm

Index: chrome/browser/storage_monitor/removable_device_notifications_mac.mm
diff --git a/chrome/browser/storage_monitor/removable_device_notifications_mac.mm b/chrome/browser/storage_monitor/removable_device_notifications_mac.mm
index d1027e45c3707fbccb2ed4130508a4cd5518ff51..a1fa41c7a5d59e416e5c8ffa97e0e538482aee9e 100644
--- a/chrome/browser/storage_monitor/removable_device_notifications_mac.mm
+++ b/chrome/browser/storage_monitor/removable_device_notifications_mac.mm
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/storage_monitor/removable_device_notifications_mac.h"
 
+#include "base/mac/mac_util.h"
+#include "chrome/browser/storage_monitor/image_capture_device_manager.h"
 #include "chrome/browser/storage_monitor/media_device_notifications_utils.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -13,6 +15,9 @@ namespace {
 
 const char kDiskImageModelName[] = "Disk Image";
 
+// TODO(gbillock): Make these take weak pointers and don't have
+// RemovableDeviceNotificationsMac be ref counted.
+
 void GetDiskInfoAndUpdateOnFileThread(
     const scoped_refptr<RemovableDeviceNotificationsMac>& notifications,
     base::mac::ScopedCFTypeRef<CFDictionaryRef> dict,
@@ -47,10 +52,17 @@ void GetDiskInfoAndUpdate(
 }  // namespace
 
 RemovableDeviceNotificationsMac::RemovableDeviceNotificationsMac() {
-  session_.reset(DASessionCreate(NULL));
+}
 
-  DASessionScheduleWithRunLoop(
-      session_, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
+RemovableDeviceNotificationsMac::~RemovableDeviceNotificationsMac() {
+  if (session_.get()) {
+    DASessionUnscheduleFromRunLoop(
+        session_, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
+  }
+}
+
+void RemovableDeviceNotificationsMac::Init() {
+  session_.reset(DASessionCreate(NULL));
 
   // Register for callbacks for attached, changed, and removed devices.
   // This will send notifications for existing devices too.
@@ -70,11 +82,14 @@ RemovableDeviceNotificationsMac::RemovableDeviceNotificationsMac() {
       kDADiskDescriptionWatchVolumePath,
       DiskDescriptionChangedCallback,
       this);
-}
 
-RemovableDeviceNotificationsMac::~RemovableDeviceNotificationsMac() {
-  DASessionUnscheduleFromRunLoop(
+  DASessionScheduleWithRunLoop(
       session_, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
+
+  if (base::mac::IsOSLionOrLater()) {
+    image_capture_device_manager_.reset(new chrome::ImageCaptureDeviceManager);
+    image_capture_device_manager_->SetNotifications(receiver());
+  }
 }
 
 void RemovableDeviceNotificationsMac::UpdateDisk(